Flower-,　wire-,　and　sheet-like　MnO2-deposited　diatomites　have　been　prepared　using　a　hydrothermal　method　with　Mn(Ac)(2),　KMnO4　and/or　MnSO4　as　Mn　source　and　diatomite　as　support.　Physical　properties　of　the　materials　were　characterized　by　means　of　numerous　analytical　techniques,　and　their　behaviors　in　the　adsorption　of　chromium(VI)　were　evaluated.　It　is　shown　that　the　MnO2-deposited　diatomite　samples　with　different　morphologies　possessed　high　surface　areas　and　abundant　surface　hydroxyl　groups　(especially　the　wire-like　MnO2/diatomite　sample).　The　wire-like　MnO2/diatomite　sample　showed　the　best　performance　in　the　removal　of　Cr(VI),　giving　the　maximum　Cr(VI)　adsorption　capacity　of　101　mg/g.　(C)　2014　The　Research　Center　for　Eco-Environmental　Sciences,　Chinese　Academy　of　Sciences.